| Parameters | 
                                    
                                                                                                                        
                                                | Mfr | 
                                                onsemi | 
                                            
                                                                                    
                                                | Series | 
                                                - | 
                                            
                                                                                    
                                                | Package | 
                                                Tape & Reel (TR) | 
                                            
                                                                                    
                                                | Product Status | 
                                                Obsolete | 
                                            
                                                                                    
                                                | Battery Chemistry | 
                                                Lithium Ion/Polymer | 
                                            
                                                                                    
                                                | Number of Cells | 
                                                1 | 
                                            
                                                                                    
                                                | Current - Charging | 
                                                Constant - Programmable | 
                                            
                                                                                    
                                                | Programmable Features | 
                                                Current, Timer, Voltage | 
                                            
                                                                                    
                                                | Fault Protection | 
                                                Over Temperature, Over Voltage, Short Circuit | 
                                            
                                                                                    
                                                | Charge Current - Max | 
                                                1.55A | 
                                            
                                                                                    
                                                | Battery Pack Voltage | 
                                                4.2V | 
                                            
                                                                                    
                                                | Voltage - Supply (Max) | 
                                                6V | 
                                            
                                                                                    
                                                | Interface | 
                                                I²C | 
                                            
                                                                                    
                                                | Operating Temperature | 
                                                -30°C ~ 85°C (TA) | 
                                            
                                                                                    
                                                | Mounting Type | 
                                                Surface Mount | 
                                            
                                                                                    
                                                | Package / Case | 
                                                20-UFBGA, WLCSP | 
                                            
                                                                                    
                                                | Supplier Device Package | 
                                                20-WLCSP (1.96x1.56) | 
                                            
                                                                                    
                                                | Base Product Number | 
                                                FAN54040 | 
                                            
                                                                                    
                                                | Moisture Sensitivity Level (MSL) | 
                                                1  (Unlimited) | 
                                            
                                                                                    
                                                | REACH Status | 
                                                REACH Unaffected | 
                                            
                                                                                    
                                                | ECCN | 
                                                EAR99 | 
                                            
                                                                                    
                                                | HTSUS | 
                                                8542.39.0001 | 
                                            
                                                                                    
                                                | Standard Package | 
                                                3,000 | 
                                            
                                                                                                                
                                
                             
                                                Charger IC Lithium Ion/Polymer 20-WLCSP (1.96x1.56)